Clamp for concrete-column forms



S. GOLDSTEIN.

CLAMP FOR CONCRETE COLUMN FORMS. APPLICATION FILED JUNE 9, 1920.

Patented Mar. 8, 1921.

2 SHEETS-SHEET l.

S. GOLDSTEIN. CLAMP FOR CONCRETE COLUMN FORMS.

APPLICATION FILED JUNE 9. 1920.

Patented Mar 8, 1921.

2 SHEETSSHEET 2.

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CLAMP FOR CONCRETE-COLUMN FORMS.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed June 9, 1920. Serial No. 387,587.

T 0 all whom it may concern:

Be it known that I, SAMUEL GoLDsTErN, a citizen of the United States, residing at 624 Howard avenue, Brooklyn, county of Kings and State of New York, have invented certain new and useful Improvements in Clamps for Concrete-Column Forms, fully described and represented in the following specification and the accompanying drawin s, forming a part of-the same.

The present invention relates to a clamp for embracing the outer sides of a concrete mold, particularly for concrete.

Such molds are commonly formed of planks which require to be held in a definite position to produce a molded body of the desired form and cross-section. 4

The invention is especially applicable to holding the plank in place for molding a column of polygonal form, and the means described herein can be used for molding a column of four or more sides and of any diameter within certain limits.

The clamp is formed of clamping-bars hinged together at one end and overlapped and crossed at corners intermediate to the pivoted ends; and the invention relates especially to the use of rigid angle-pieces for application to the clamping-bars outside of their crossing-points.

These angle-pieces are constructed to lie upon the flat sides of the clamping-bars and are provided with flanges extending along the edges of the clamping-bars, and such flanges are preferably provided with hookpieces which project beneath the clampingbars so as to wholly embrace the bars.

The two arms of each angle-piece are connected at their'in'ner corner, and their embrace of two clamping-bars serves to hold the fiat sides of the clamping-bars in contact with one another at their crossing-point.

A series of slots/is formed lengthwise in the clamping-bars, and one or more slots in each arm of the angle-piece adapted to receive a wedge which presses against the outer end of a slot in the clamping-bar and against the inner end of a slot in the angleiece.

When the wedge is thus crowded into the against one side of the mold.

Wedges are operated in both arms of the angle-piece simultaneously or successively and thus tighten the mold-planks upon two sides of the mold.

One clamping-bar is required for each side of the mold, and with a four-sided mold two jointed pairs of the clamping-bars are required. In like manner, one-half as many pairs are employed as there are sides upon the mold. v

The invention will be understood byreference to the annexed drawing, in which Figure 1 is a plan of the clamping device applied to a four-sided mold; Figs. 2 and 3 show the device applied respectively to molds with six and eight sides. Fig. 4 is a plan of two clamping-bars joined together by a pivot; Fig. 5 is a plan of one anglepiece; Fi 6 is a section on line 6-6 in Fig. 5; 1g. 7 is a section on line 77 in Fig. 5; Fig. 8 is a side elevation of the clamping device with one side of the mold formed of four planks; Fi 9 is a section on line 9-9 in Fig. 5; and ig. 10 is a sideview of a wedge. Fig. 6 shows the clamping-baralso, with the Wedge inserted in the slots of the angle-piece and clamping-bar, the wedge being shown in dotted'lines.

Figs. 4:, 5, 6, 7 and 9 are drawn upon a lar er scale than the other figures.

eferri'ng to Fi 1, a represents the planks of a four-sided mold. are the clamping-bars formed each with a series of slots 0 as shown in Fi 4, hinged together at one end by pivot b Two pairs-of the clamping-bars are shown in Fig. 1 and two angle-pieces consisting of the arms (1 connected rigidly together and fitted to the flat sides of the clamping-bars outside of their crossing-point.

The arms of the angle-piece are not secured to the clamping-bars, but are provided each with a flange f or f fitted to the outer edge of the clamping-bars outside of their crossing and such flanges are preferably provided each with a hook-piece g or 9 extending beneath the clamping-bars and serving to hold the same in contact with the bars which it crosses adjacent to the corner of the anglepiece,'and to guide the wedg in a vertical line.

The hook-piece 9 forms, as shown in Fig.

6, a groove or channel it which is fittedto one of the clamping-bars, and as such clamping-bars cross one another they do not lie in the same plane, and the channels for them in the respective arms of the anglepieces are made on different planes.

One of the channels h, as shown at the left-hand end ofFig. 6, is in a line with the plate of the angle-piece, but the channel h in the other arm is below the level of the plate, as shown at the right-hand end of The arms of the angle-pieces are shown provided with slots 6 and e which, in practice, are sloped at one end to fit the wedge 2', and are made longer than the slots 0 in the clamping-bars to clear the vertical side of the slot from the wedge. The slots 6' and e are extended through the hook-piece g in their passage through the slot of the clamping-bars which lie in the channel h.

When the angle-pieces are applied to the bars at their crossing, as shown in Fig. 1, the ends of the bars extend outside of their crossing and the flanges f and f of the two angle-pieces are fitted to the outer edges of such clamping-bars.

The slot 0 in the angle-piece is made longer than the slots 0 so as to permit the point of the Wedge to enter one or another of the adjacent slots 0 through the slot (2, as shown in Fig. 6. When the wedge is thus adjusted and driven into the slots it draws the end of the clamping-bar out- Wardl from its crossing, the flange f upon the ot er arm of the angle-piece sustaining the strain of thus crowding the clampingbar and tightening the planks along which it lies.

The range of the draft or pullrefi'ectcd by the complete movement of the wedge may be. in ractice made about one inch, and

when t e wedge has effected such specific movement-as shown in Fig. 6, the adjacent slot 9 would be accessible to the long slot 0 and the tightening movement can be continued by Inserting another wedge in such other slot, continulng the movement as far as re uired.

Eit er of the slots 6, 6' can be used in each angle-piece, which appears to be in the most favorable position to insert the wedge. The wedges are left in the slots when the mold is fully tightened, retaining the clamping-bars in their adjusted position until the mold is dismantled' The operation is precisely the same with a mold of six or eightsides, but the angleiece is made with an angle of 120 degrees Between its arms for a six'sided mold, and

135 degrees for the eight-sided mold, instead alternate corners the same as in the foursided mold, the pivots of the clamping-bars arm to support the other; that is, to resist the thrust of the wedge upon the arm and thus enable it to directly pull or draw upon the clamping-bar.

,To enable the angle-arms to sustain one another in tightening up the mold, it is desirable that wedges should be inserted through the slots 0 or e of each anglcarm, thus holding each arm fixed upon its clamping-bar while the wedge is being tightened in the other arm.

The two arms of the angle-piece may, to facilitate shipping, be made separate, and engaged together in any desired manner to connect them rigidly when in operation.

I am aware that clamping-bars perforated with bolt-holes are old, and that an gle-pieces have been used in connection with such angle-bars to support the thrust of a cam, but the cam is not used in such case as a locking-member, and such bars can only be secured together at certain fixed distances at which the bolt-holes are located; whereas the employment of wedges in my construction permits the clamping-bars to be tightened up to any amount greater or less and held or locked rigidly in such tightened position by the same means which tighten them namely, the wedge inserted in the slot.

In my construction the wedge performs a twofold function, as it is the tightening agent as well as the locking agent for the clamps when tightened.

Having thus set forth the nature of the invention what is claimed herein is:

1. A clamp for concrete column forms having clamping-bars overlapped and crossed at a corner of a mold, and angle-pieces having arms connected together in different planes and fitted to the sides of the crossed clamping-bars, the said bars and the arms of the angle-pieces having slots with wedges fitted thereto and operating respectively to press the said arms against the adjacent sides of the mold.

2. A clamp for concrete column forms angle-pieces being provided with slots and wedges to crowd the bars at their crossingagainst the mold-planks.

3. A clamp for concrete column forms comprising at least two pairs of clampingbarscach with a series of uniformly spaced short slots and the bars overlapped and crossed at corners intermediate to their pivrsvoeee ots, and angle-pieces having flanges fitted to the clamping-bars outside of their crossings, and the arms of each angle-piece having long slots to receive a wedge adapted to cooperate successively with the short slots in the clamping-bars.

e. A clamp for concrete column forms comprising at least four clamping-bars pivoted in pairs and formed each with a series of uniformly spaced short slots, and the bars overlapped and crossed at corners interme diate to their pivots, and angle-pieces having flanges fitted to such clamping-bars outside of their crossing and having long slots to receive a wedge adapted to cooperate with the short slot in the clamping-bars. V

A clamp for concrete column forms comprising at least two pairs of clampinghars each pair having its bars pivoted together at one end and formed with a series of uniformly spaced short slots and overlapped at corners intermediate to the pivots, and angle-pieces with 'flanges fitted to such clamping-bars outside of their crossing, and having long slots adapted to admit a wedge in connection with the short slots in the clampin -bars, such wedge operating to crowd the angle-piece and the clamping-bar against the planks of the mold,

6. clamp for concrete column forms comprising at least two pairs of clampingoars each pair having its bars pivoted together at one end and formed with a series of short slots and overlapped and crossed at corners intermediate to the pivots, and angle-pieces having slots to cooperate with those in the clamping-bars, and flanges fit- 1 ted to such clamping-bars outside or" their crossing, each flange having a hook-plate to embrace the under side of the clamping-bars and hold it movably in place when fitted thereon.

7. A clamp for concrete column forms comprising at least two pairs of clampingbars each pair having its bars pivoted together at one end and formed with a series of uniformly spaced slots, and overlapped and crossed at corners intermediate to the pivots, angle-pieces having slots to cooperate with those in the clamping-bars, and having flanges fitted to the outer edges of such clamping-bars at their crossing, and two slots longer than the slots in the clamping-bars, adapted to admit a wedge in one of the longer slots and one of the short slots during a specific clamping movement of the clamping-bars, and to thereafter engage the other long slot with one of the short slots in the clamping-bars,

8. A clamp for concrete column forms comprising at least two pairs of clampingbars each pair having its bars pivoted together at one end and formed with a series of short slots and overlapped and crossed at corners intermediate to the pivots, and angle-pieces having two arms each formed with flanges fitted to such clamping-bars outside of their crossing and both arms having a series of slots, and wedges fitted through slots in both of the said armsand engaging slots in the corresponding clamping-bars and operating when tightened in the slots to crowd both clamping-bars against the planks of the mold.

9. A clamp for concrete column forms having pairs of clamping-bars each pair having its bars pivoted together at one end and overlapped and crossed at corners intermediate to the pivots, angle-pieces having arms connected together in two planes and fitted to rest upon the sides of the crossed clamping-bars, the said bars and the arms of the angle-pieces having slots adapted to admit wedges and havin flanges fitted to such clamping-bars outside of their crossing and each flange having a hooleplate to embrace the under side of the clamping-bar and, operating to hold the sides of the crossed clamping-bars in contact with one another intermediate to the pivoted end.

In testimony whereof I have, hereunto set my hand.

SAMUEL oonos'rnm. 

